- 删除有序数组中的重复项 II：https://leetcode.cn/problems/remove-duplicates-from-sorted-array-ii/description/
- 删除有序数组中的重复项：
https://leetcode.cn/problems/remove-duplicates-from-sorted-array/?envType=study-plan-v2&envId=top-interview-150
- 移除元素：https://leetcode.cn/problems/remove-element/description/?envType=study-plan-v2&envId=top-interview-150
合并两个有序数组：https://leetcode.cn/problems/merge-sorted-array/?envType=study-plan-v2&envId=top-interview-150